GCN Circular 16789
Subject
GRB 140907A : Optical observations from Nanshan
Date
2014-09-07T18:03:54Z (10 years ago)
From
Dong Xu at DARK/NBI <dong.dark@gmail.com>
D. Xu (DARK/NBI), X. Gao (Urumqi No.1 Senior High School, Xinjiang),
G.-J. Feng, A. Esamdin, L. Ma (XAO), Z.-J. Xu (Nanjing Putian
Telecommunications Co. Ltd., Jiangsu) report:
We observed the field of GRB 140907A (Krimm et al., GCN 16788) using
the 35cm robotic telescope and the 1m optical telescope located at
Nanshan, Xinjiang, China. The observations started at 16:18:42 UT on
2014-09-07 at the 35cm telescope without any filter, and 16:34:28 UT
at the 1m telescope in the R filter.
The afterglow is well detected in our images at coordinates
R.A. (J2000) = 03:12:34.98
Dec. (J2000) = +46:36:17.2
Error radius: ~ 0.7 arcsec
which is fully consistent with the UVOT position. Generally, the
afterglow has been decaying, and follows are the preliminary
measurements from the 35cm telescope:
Mid-Time Mag
2014/09/07.68001 16.7
2014/09/07.68083 16.7
2014/09/07.68164 16.7
2014/09/07.68244 16.9
2014/09/07.68325 17.0
2014/09/07.68405 17.1
2014/09/07.68485 17.0
2014/09/07.68565 16.9
2014/09/07.68646 17.2
with a typical error of 0.2 magnitude, calibrated with the R-band
catalog of NET CMC-14.
Observations are ongoing.